How do I reinstall the FreeBSD bootmanager?

[Bob Willcox]

I need to reinstall the FreeBSD bootmanager on one of my systems and
was hoping someone can point me in the right direction on doing this.
I tried running /sbin/sysinstall but decided that I wasn't confident
enough of what I was doing to risk trashing my install.

BTW, this is on an amd64 6-current system incase it matters.

Thanks,
Bob

-- 
Bob Willcox                Reality is nothing but a collective hunch.
bob at immure.com                     -- Lily Tomlin
Austin, TX